EP 2045342 A1 20090408 - NOBLE METAL ALLOY FOR SPARK PLUG AND METHOD FOR PRODUCING AND PROCESSING THE SAME
Title (en)
NOBLE METAL ALLOY FOR SPARK PLUG AND METHOD FOR PRODUCING AND PROCESSING THE SAME
Title (de)
EDELMETALLLEGIERUNG FÜR EINE ZÜNDKERZE SOWIE VERFAHREN ZU IHRER HERSTELLUNG UND BEARBEITUNG
Title (fr)
ALLIAGE DE MÉTAL NOBLE POUR BOUGIE D'ALLUMAGE ET SON PROCÉDÉ DE FABRICATION ET DE TRAITEMENT
Publication
Application
Priority
- JP 2007064482 W 20070724
- JP 2006202471 A 20060725
- JP 2007097465 A 20070403
Abstract (en)
An object of the present invention is to provide a material for a precious metal tip of a spark plug, which has more excellent durability, particularly oxidation wear resistance than a conventional one. The precious metal alloy for the spark plug according to the present invention contains 0.2 to 6.0 wt.% Cr as an essential component, further at least any one of Fe or Ni, and the balance being Ir. Here, the amount of Fe and Ni to be added is preferably 2.0 to 12.0 wt.% in total. According to the present invention, the surface may be oxidized to form an oxide layer made from a Cr-Fe oxide, a Cr-Ni oxide or a Cr-Fe-Ni oxide. The oxide layer is formed by a diffusion treatment by heating the precious metal alloy at 300 to 900°C in an oxidative atmosphere, and preferably has a thickness of 5 to 100 µm.
IPC 8 full level
C22C 1/04 (2006.01); C22C 5/00 (2006.01); C22F 1/14 (2006.01); C23C 6/00 (2006.01); C23C 26/02 (2006.01); H01T 13/39 (2006.01); H01T 21/02 (2006.01)
CPC (source: EP US)
C22C 1/0466 (2013.01 - EP US); C22C 5/00 (2013.01 - EP US); C22F 1/14 (2013.01 - EP US); C23C 6/00 (2013.01 - EP US); C23C 26/02 (2013.01 - EP US); H01T 13/39 (2013.01 - EP US); H01T 21/02 (2013.01 - EP US); B22F 2998/10 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA HR MK RS
DOCDB simple family (publication)
EP 2045342 A1 20090408; EP 2045342 A4 20100901; EP 2045342 B1 20120905; JP 4430119 B2 20100310; JP WO2008013159 A1 20091217; US 2009293995 A1 20091203; US 8029628 B2 20111004; WO 2008013159 A1 20080131
DOCDB simple family (application)
EP 07791214 A 20070724; JP 2007064482 W 20070724; JP 2008526770 A 20070724; US 6466507 A 20070724